62t cylinder exhaust port timing

[Mouthfulloflake]

so I read were these 62y cylinders have a higher exhaust port opening.

I slide my sport port template into one, and it is the same as it fits a 61x cylinder?

the casting of the cylinder could be taller, but the sleeve is lower like the 61x .

are they all like this, or has this one been messed with?

just curious!

Thanks

 

[Matt_E]

Err...that's confusing. You mean the template lines up top of the cylinder, top of the port, and bottom of the port?

Why, that's un-possible! LOL...seriously, I remember it lines up 100% on a 61x, so it shouldn't line up on a 62T.
How could it have been messed with to lower a port?

 

[Mouthfulloflake]

thats what I was thinking Matt.

Ill get some pictures later.

it does line up on the top of cylinder, and the top of port, I think the bottom too.

 

[keefer]

Yeah, I don't see how that would be possible. When I had a 62t and 61x cyl on the bench side by side, I seem to remember that the 62t exh. ports were about 4mm closer to the top deck. All other ports measured the same height. Maybe it is an alien cylinder from area 51:sneaky:

 

[Matt_E]

Matt, please measure the exact distance from deck to port top and port bottom...I'll do the same to my 61x.

 

[Mouthfulloflake]

ive got no way to measure and be exact, here are some pics of the sport port tmplate in there though.

let me know.
Il try and measure somehow later.

 

[Matt_E]

Err....that handwriting looks familiar

Uh...that looks like it has a 61x sleeve installed. I haven't seen that before. I guess it's possible to do that...call Paul. He might know.

 

[romack991]

Err....that handwriting looks familiar

what you you talkin bout??:27:


:sneaky: :sneaky: :sneaky:

 

[Mouthfulloflake]

Well, since my name happens to be Matt also.

I can understand your confusion MattE.

:biggrin:

 

[Matt_E]

:sneaky: :biggrin:

 

[S&Ssuperjets]

Is the 61 x or the 62t the better cylinder to run ??

 

[Matt_E]

For what?

 

[S&Ssuperjets]

For bottom end I looking at a 760 62t . I was looking at reslaveing a 61x also to 760 .

 

[Matt_E]

If you're on a budget, get a 62T cylinder. If you're wanting more bottom end, go with a 61x with either a smaller bore (than 84mm) or re-sleeve to bigger sleeves $$$

 

[Mouthfulloflake]

so are you sure my 701 62t is not a normal one MattE?

I was hoping that the other one I have coming in the mail would have the same port height as the one I posted.

:biggrin:

I dont know yet.

when I get it, I will post pics.

 

[Matt_E]

No, I don't think it's normal...

 

[accbr]

I have a virgin 61x cylinder I just checked with some calipers. It's measures 40.6 mm from the top of the exhaust port to the top of the cylinder.

 

[Mile9c1]

All the 62T's I've seen have been a few mm higher, I don't remember exactly because it's hard to measure from the exact top of the exhaust port.

 

[WAB]

My 1994 62t Raider cyl had that sleeve overhang also at the top of the exhaust port. It's like Yamaha made a different casting for the 62t cyl., but then used the regular 61x sleeves, hence the overhang. . ?
Maybe the 760 cast is the same as 62t cyl casting, but has the 760 sleeves with ports raised and matched as they should be?? I noticed on the GP1200 sleeves I just got have large, tall, squared off ports. I have not measured them though. They are supposedly the similar to 760 sleeves & I am hoping they will work with the stroke.

 

[keefer]

No, I don't think it's normal...

I'm tellin ya, its from area 51. Alien cylinder, might check and make sure it doesn't glow in the dark:haha: